Open/close valve



FIG. 1 is a perspective view of an open/close valve;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right-side view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a cross-section view thereof, taken along line 8-8 of FIG. 4.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for an open/close valve, as shown and described. 